Microsoft's latest update reveals that Windows 10 mobiles will support lots of hardwares from low range phones to high range.

Microsoft posted a status which shows the types of devices Microsoft expect OEMS to explore.

The devices include value phones and phablets, and also what Microsoft calls Premium Phones. And all new devices will support 4G/LTE which enables the users for faster surfing and downloading.
The Premium handset is expected to feature Windows Hello (via IR Face
Unlock), 2-4 GB of RAM, at least 32 GB storage, a full HD screen or
better, 20 megapixel camera, and be less than 7.5mm thick and less than
160 g.

And in the status update by Microsoft we can see than there is a wild range of unique and interesting features coming to Windows 10....!

In the document Microsoft reveals the IR camera takes up about the same
space as a normal front-facing camera, and that the camera does not have
to have depth sensing, and of course fit into a less than 7.5mm thick
device, meaning that the technology has already matured to the point
where it would fit into a smartphone and still be affordable, and also
suggesting that Microsoft’s next flagship will certainly have IR Face
Unlock rather than the more finicky Iris Unlock.